Definify.com

Webster 1913 Edition

Adj.

Not mannerly; ill-bred; rude.

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adv.

Uncivilly; rudely.

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Un-man′ner-li-ness

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Noun.

, a.

Ill bred; not having good manners; rude in behavior; as an unmannerly youth.

Not according to good manners; as an unmannerly jest.

adv.

Uncivilly.

unmannerly ‎(comparative more unmannerly, superlative most unmannerly)

unmannerly ‎(comparative more unmannerly, superlative most unmannerly)

In a way that is not mannerly.
- Shakespeare
  their daggers unmannerly breeched with gore